Crossword Genius

"Which one of Arthur's knights built the Round Table? ___ Cumference!" (groaner) (3)

Ross

I believe the answer is:

sir

(Other definitions for sir that I've seen before include "Poet and novelist" , "Polite form of address to a man" , "Form of address for a knight" , "Baronet's title" , "Title of Kt or Bart" .)

I've seen this clue in The New York Times.
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